//===============================================================================
// Microsoft patterns & practices
// Web Client Software Factory
//===============================================================================
// Copyright � Microsoft Corporation.  All rights reserved.
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE.
//===============================================================================
// The example companies, organizations, products, domain names,
// e-mail addresses, logos, people, places, and events depicted
// herein are fictitious.  No association with any real company,
// organization, product, domain name, email address, logo, person,
// places, or events is intended or should be inferred.
//===============================================================================

using System;
using Microsoft.Practices.ObjectBuilder;

namespace Microsoft.Practices.CompositeWeb
{
    /// <summary>
    /// Base class for dependency attributes that can be made optional.
    /// </summary>
    public abstract class OptionalDependencyAttribute : ParameterAttribute
    {
        private bool _required = true;

        /// <summary>
        /// Whether the dependency is required. Defaults to true.
        /// </summary>
        public bool Required
        {
            get { return _required; }
            set { _required = value; }
        }

        /// <summary>
        /// See <see cref="ParameterAttribute.CreateParameter"/> for more information.
        /// </summary>
        public abstract override IParameter CreateParameter(Type memberType);
    }
}
